Terminal for pneumatic-despatch tubes



(No Model.)

A B CAMPBELL TERMINAL FOR PNEUMATIC DESPATGH TUBES. No. 563,359.

Pat nted July 7, 1,96.

Ill llll zzz 7 plan View of the terminal.

UNITED STATES PATENT .OFFICE.

AMMI B. OAMPBELL,OE LOWELL, MASSACHUSETTS, ASSIGNORjTO THE METEORDESPATOH COMPANY, OF BOSTON, MASSACHUSETTS.

TERMINAL FOR PNEUMATlC-DESPATCH TUBES.

SPECIFICATION forming part of Letters Patent No. 563,359, dated July 7,1896.

. Application filed July 28,1893. Serial No. 481,793. (No model.)

To 0055 whom it may concern.-

Be it known that I, AMMI B. CAMPBELL, of Lowell, county of Middlesex,and Commonwealth of Massachusetts, have invented certain new and usefulImprovements in Terminals for Pneumatic-Despatch Tubes; and I do herebydeclare that the following is a full, clear, and exact description ofthe invention, which will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to certain new and useful improvements in terminalsfor pneulnatic-despatch tubes; and it consists of certain novelfeatures, arrangements, and combinations hereinafter described, andparticularly pointed out in the claims.

In the drawings, Figure 1 represents a central longitudinal sectionthrough the terminal on the line 00 00, Fig. 3. Fig. 2 is a crosssectionon the line y y, Fig. 3 is a Fig. 4 is an inverted plan View of thevalve.

In the drawings like letters of reference refer to like parts throughoutthe several views.

The terminal A is provided with an inlettube B, leading tothe center ofthe diameter of the case, as indicated by the broken line 1 2. This tubeis carried to this point, so that the pressure therein will givesufficient momentum to the carrier that it will continue through thepassage 0 to the valve 0, and if the current of air should be brokenbefore the carrier passes beyond the center of the passage 0 the carrierwill fall back into the inlet-tube B, where it will rest until thecurrent of air is again restored, when it will at once resume its travelto the outlet-valve O.

The terminal A consists of an outer curved guiding-plate A and an innercurved guiding-plate A drawn on circles having different centers ofcurvature, so as to provide sufficient space in the upper part of thepassage 0 that the carrier will not be obstructed. The ends A of theouter plate A are brought down straight, as shown, after leaving thebroken line 1 2, so that the carrier at the delivery end is deliveredendwise to the valve 0, which is thereby opened by the impact of thecarrier, after which the valve C closes by the pressure in the system.

In order to return-the carrier to the station from which it is sent, theinner plate A is perforated or cut away, as shown at A so that thepressure will continue through the pipe D, secured to the base-plate Aof the terminal. The carrier to be returned is placed in the branch tubeD, covered by a self-o10sing clapper D which has on the hinged side aprojection D This projection prevents the clapper being thrown back sofar that it will not close by its own weight after the introduction ofthe carrier, which is necessary to keep up the current of air in thesystem for its proper working.

I do not limit myself to the exact arrangement and construction shown,as the same may be varied without departing from the spirit of myinvention.

Having thus ascertained the nature and set forth theconstruction ofmyinvention, what I claim as new, and desire to secure by Letters Patentof the United States, is-

1. Aterminal for pneumatic-despatch-tube systems, having a base-plateprovided with a discharge outlet for the carriers and with openings inwhich are secured the inlet and return tubes, a curved inner platehaving one end secured adjacent to the entrance of the inlet-tube andthe other end secured adjacent to the base-plate and to thedischargeoutlet, an outer curved guiding-plate which with the saidcurved inner plate forms a passage for the carriers through the terminalfrom the inlet-tube to the discharge-outlet, the said curved inner platebeing cut away at its sides to provide an opening for establishingcommunication for the air-current between the said passage and the saidreturntube, and a valve normally closing the said discharge-outlet inthe base-plate.

2. A terminal for pneumatic-despatch-tube systems having a base-plateprovided with a dischargeoutlet for the carriers and with openings inwhich are secured the inlet and return tubes, curved inner and outerguiding-plates drawn on circles having different centers of curvature,the said curved inner plate having one end secured adjacent to theentrance of the inlet-tube and the other end secured adjacent to thebase-plate and to the discharge-outlet and forming with the outer curvedguiding-plate a passage for the carliBlS through the terminal from theinlet-tube t0 the discharge-outlet, the said curved inner plate beingcut away at its sides to provide an opening for establishingcommunication for the air-current between the said passage and the saidreturn-tube, and a Valve normally closing the said discharge-outlet inthe base-plate.

